EP2485395A1 - Console de mélange audio évitant une surcharge du niveau sonore - Google Patents

Console de mélange audio évitant une surcharge du niveau sonore Download PDF

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Publication number
EP2485395A1
EP2485395A1 EP11153360A EP11153360A EP2485395A1 EP 2485395 A1 EP2485395 A1 EP 2485395A1 EP 11153360 A EP11153360 A EP 11153360A EP 11153360 A EP11153360 A EP 11153360A EP 2485395 A1 EP2485395 A1 EP 2485395A1
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EP
European Patent Office
Prior art keywords
signal
gain
signal level
amount
amplifier
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP11153360A
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German (de)
English (en)
Other versions
EP2485395B1 (fr
Inventor
Richard Ayres
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Harman International Industries Ltd
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Harman International Industries Ltd
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Publication date
Application filed by Harman International Industries Ltd filed Critical Harman International Industries Ltd
Priority to EP20110153360 priority Critical patent/EP2485395B1/fr
Priority to JP2012012746A priority patent/JP5848141B2/ja
Priority to US13/364,761 priority patent/US9008334B2/en
Priority to CN201210024792.7A priority patent/CN102629853B/zh
Publication of EP2485395A1 publication Critical patent/EP2485395A1/fr
Application granted granted Critical
Publication of EP2485395B1 publication Critical patent/EP2485395B1/fr
Active legal-status Critical Current
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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G7/00—Volume compression or expansion in amplifiers
    • H03G7/002—Volume compression or expansion in amplifiers in untuned or low-frequency amplifiers, e.g. audio amplifiers
    • H03G7/004—Volume compression or expansion in amplifiers in untuned or low-frequency amplifiers, e.g. audio amplifiers using continuously variable impedance devices
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers without distortion of the input signal
    • H03G3/20—Automatic control
    • H03G3/30—Automatic control in amplifiers having semiconductor devices
    • H03G3/3005—Automatic control in amplifiers having semiconductor devices in amplifiers suitable for low-frequencies, e.g. audio amplifiers
    • H03G3/301—Automatic control in amplifiers having semiconductor devices in amplifiers suitable for low-frequencies, e.g. audio amplifiers the gain being continuously variable
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M1/00—Analogue/digital conversion; Digital/analogue conversion
    • H03M1/12—Analogue/digital converters
    • H03M1/18—Automatic control for modifying the range of signals the converter can handle, e.g. gain ranging
    • H03M1/181—Automatic control for modifying the range of signals the converter can handle, e.g. gain ranging in feedback mode, i.e. by determining the range to be selected from one or more previous digital output values
    • H03M1/183—Automatic control for modifying the range of signals the converter can handle, e.g. gain ranging in feedback mode, i.e. by determining the range to be selected from one or more previous digital output values the feedback signal controlling the gain of an amplifier or attenuator preceding the analogue/digital converter

Definitions

  • the present invention relates to an audio mixing console and to a method for operating an audio mixing console.
  • an audio mixing console comprising a first amplifier receiving an analogue audio input signal configured to amplify the received audio input signal with a first adjustable gain. Further, an analogue to digital converter is provided receiving the amplified analogue audio input signal, the converter being configured to generate a digital audio signal by analogue to digital conversion of the amplified analogue audio signal. Furthermore, a second amplifier is provided receiving the digital audio signal, the second amplifier being configured to amplify the received digital audio signal with a second adjustable gain.
  • the mixing console further comprises a gain range control unit configured to identify a signal level overload at the analogue to digital converter, and configured to control the gain of the first and second amplifier respectively.
  • the gain range control unit When the gain range control unit identifies an occurrence of signal level overload, it reduces the first gain, at the first amplifier, by a first amount and increases the second gain, at the second amplifier, by the first amount.
  • the above-described mixing console allows the system gain and peak signal levels to be preserved in order to minimise the impact on level or balance of any mixes made from a combination of input sources. Furthermore, with the console an almost totally distortion free environment can be guaranteed and it can help to reduce damage to speaker components that could occur in high distortion environments.
  • the analogue audio input signal As the analogue audio input signal is converted to a digital signal the provided digital signal offers an opportunity to address the problem as mentioned in the introductory part since, in the digital domain automated control of parameters is possible in easily defined and measured steps.
  • the occurrence of the signal level overload can be determined at the AD (analogue to digital) converter.
  • the first gain at the first amplifier is reduced directly after identifying the occurrence of a signal level overload.
  • the gain control unit then furthermore detects whether the signal overload is still present at the analogue to digital converter. If this is the case the first gain at the first amplifier is reduced by the first amount and the second gain at the second amplifier is increased by the first amount until the signal level overload is not detected anymore.
  • the gain range control unit is configured to estimate an amount of signal level overload, wherein, when the signal level overload is detected, the gain range control unit estimates the amount of signal level overload and reduces the first gain at the first amplifier in dependence on the estimated signal level overload by the first amount and increases the second gain at the second amplifier by the same amount.
  • the gain range control unit is configured to identify the signal level overload by determining whether the signal level of the digital audio signal is higher than a predefined first threshold and by determining whether a number of consecutive audio signal samples of the predefined first threshold is higher than a predefined second threshold, wherein the gain range control unit can identify the occurrence of the signal level overload situation when a number of consecutive samples having a signal level above the first threshold is higher than the second threshold.
  • the first threshold and the second threshold i.e. the maximum signal level and the number of signal samples over the maximum signal level, can be determined by the user.
  • the mixing console offers the user a possibility to set his/her own definition of overload within prescribed and defined ranges.
  • the user can determine according to his/her needs that a signal at or in the AD converter is overloading or is at risk of overloading.
  • the definition of overload may be defined by absolute events such as "two or more consecutive samples above the first threshold", or above “a full-scale deflection” or "two or more samples of greater amplitude than the defined overload threshold”.
  • the user can furthermore define parameters such as "how many consecutive overload samples may occur over a given period of time before the gain range control unit reacts by reducing the first gain and by increasing the second gain by the same amount".
  • the determination of the signal level overload situation can be helpful for preventing very small samples from triggering the gain range control unit to reduce the first gain in events such as a microphone being dropped.
  • the analogue audio input signal can be a signal coming from a microphone. Especially in wireless microphones, where the initial input gain is frequently set on the transmitter device and where there is no mechanism for the mixing console operator to reduce this gain in the event that audio levels result in overload of the wireless system, the present invention can help to avoid these situations
  • One possibility to determine the signal level overload is the gain range control unit interpolating a signal level evolution of the digital audio signal using a signal level evolution of a predefined number of last detected signal samples.
  • the gain range control unit can then determine by which amount the digital audio signal would have been higher than the predefined first threshold.
  • the gain range control unit can then reduce the first gain by the determined amount and can increase the second gain by the determined amount in order to avoid the signal level at the AD converter being higher than the predefined first threshold.
  • the gain range control unit extrapolates the signal level evolution based on the predefined number of last detected signal samples. In this situation a future overload may be detected before it actually happens.
  • the gain range control unit may be configured to interpolate the signal level evolution, taking into account a rise time of the signal level in a predefined number of last signal samples and/or taking into account a number of signal samples above the predefined threshold.
  • the gain range control unit determines the first amount of gain reduction in such a way that the signal level of the digital audio signal at the analogue to digital converter is lower than a predefined peak signal level.
  • This predefined peak signal level can be the signal level where clipping would occur or can be any other signal level.
  • the invention furthermore relates to a method for operating an audio mixing console, the method comprising the steps of amplifying, by a first amplifier, an analogue audio input signal with a first adjustable gain.
  • the amplified analogue audio input signal is then converted to a digital audio signal by the analogue to digital converter, the digital audio signal being amplified by a second amplifier.
  • a signal level overload is identified at the analogue to digital converter and the amount of signal level overload is estimated when the signal level overload has been identified.
  • the amount of signal level overload is estimated and the first gain at the first amplifier is reduced in dependence on the estimated signal level overload by a first amount and the second gain at the second amplifier is increased by the same amount. This method helps to preserve the overall system gain and helps to preserve the dynamics of the original signal.
  • FIG. 1 an audio mixing console is schematically shown. In the embodiments shown in the Figs. only the components of the audio mixing console necessary for the understanding of the invention are described, other components being omitted for the sake of clarity.
  • An audio input signal 10 e.g. a microphone signal
  • the audio input signal is a -30dB signal. With a gain of 40dB an audio output signal 12 of +10dB is obtained that is fed to an analogue to digital converter 13.
  • the digital audio signal is then transmitted to a second amplifier 14 where a second amplification is carried out, e.g. by 5dB resulting in a digital audio signal 15 having 15dB.
  • the audio input signal 10 in the example shown having -15dB is fed to the first adjustable amplifier 11 where a gain of 40dB is obtained.
  • the analogue to digital converter 13 may have a maximum input level of +20dB. With the gain of 40dB after the first amplifier 11 the signal attempts to reach +25dB. However as the AD converter can only process signals at +20dB a clipped audio signal 12' is obtained. After the second amplifier the distorted audio signal 15' would be obtained.
  • Fig. 3 an audio mixing console is shown with which the overload situation discussed above in connection with Fig. 2 can be avoided.
  • the audio input signal 10 with a signal of -15dB is input into the first amplifier 11 where the signal should be amplified with a gain of +40dB resulting in an amplified signal 12 of 25dB.
  • the maximum input level of the AD converter 13 is 20dB, clipping would occur.
  • This overload situation is detected by a gain range control unit 20 which detects an overload situation at the AD converter.
  • the user of the system shown in Fig. 3 can define rules to determine when overloading occurs at the converter 13.
  • the user can set a peak signal level as a first threshold.
  • the user can set a number of samples with a signal level higher than the first threshold, this number of samples being the second threshold. Based on these two parameters an overload situation may be detected by the gain range control unit.
  • an overload situation may exist.
  • the control unit can control the first amplifier by instructing the first amplifier to reduce the gain in order to avoid the overload situation.
  • the control unit 20 may reduce the +40dB setting to +35dB analogue gain resulting in the 20dB audio signal 12. This signal can then be processed correctly by the AD converter 13.
  • the control unit 20 can instruct the second amplifier 14 to increase the amplification by the same amount, here 5dB. Instead of the originally intended +5dB the amplification is then 10dB resulting in a 30dB digital signal 15 at the output.
  • the input gain control of amplifier 11 occurs automatically, however, the principle discussed above can also be used on systems with manually adjustable gain controls in which the control unit 20 is used to advise the operator on a recommended action.
  • the method for determining a signal level overload by the control unit 20 can be based on interpolation as will be described in connection with Fig. 5 in more detail.
  • Fig. 5 an audio signal 30 is shown for which an overload situation would occur at the analogue to digital converter.
  • the control unit can determine the maximum level of the audio signal as indicated by the dashed lines.
  • the amount of signal level overload 31 can be estimated and the amplification of the first amplifier can be reduced by the determined amount of signal level overload. Simultaneously the gain of the second amplifier can be increased by the same amount.
  • control unit may use the result of the estimation of the amount of signal level overload to take proactive action.
  • the signal evolution of section 30a may be used to extrapolate the signal evolution. In this situation the system reacts before the overload actually occurs.
  • the overload situation as shown in Fig. 5 may have occurred and the result of the estimation based on sections 30a and 30b of the signal level overload can be used to take reactive action.
  • Fig. 4 the steps for controlling a signal level in an audio mixing console according to a first embodiment are summarised.
  • the method starts in step 41 and in step 42 the audio input signal is amplified at the first amplifier 11.
  • the analogue to digital conversion is carried out at AD converter 13.
  • the gain range control unit 44 determines whether a signal level overload situation can be identified. The way in which such a signal level overload situation can be detected was discussed above in connection with Fig. 5 . If a signal level overload has been detected the amount of signal level overload is estimated in step 45.
  • step 46 the amplification of the audio input signal at the first amplifier is reduced in such a way that the overload is avoided and at the same time in step 47 the amplification of the digital audio signal at the second amplifier 14 is increased by the same amount. If no signal overload situation is detected in step 44, the control of the two amplification stages is not necessary and the signal can be provided for further processing without any additional steps. The method ends in step 48.
  • the amount of signal level overload was estimated before the system i.e. the gain range control unit reacted.
  • the gain range control unit simply reduces the gain at the first amplifier by the first amount and increases the gain at the second amplifier by the second amount. If the overload continues the same process is repeated until the overload situation is not detected anymore.
  • step 60 the audio input signal is amplified and in step 62 the analogue to digital conversion takes place. These two steps correspond to steps 42 and 43 of Fig. 4 .
  • step 63 it is checked whether an overload situation at the analogue to digital converter exists. If an overload situation is detected, the amount of overload is not detected as in Fig. 4 , but the amplification of the audio input signal is directly decreased by a first amount and the digital audio signal amplification is increased by the second amount (step 65). In the next step 66 it is then checked whether the overload situation still applies. If yes, steps 64 and 65 are repeated until no overload situation is detected at step 66 anymore, the method ending in step 67.
  • the adaptation described above may be used with user adjustable parameters to set the sensitivity and the aggression of the gain adaptation to suit local conditions, environments or requirements.
  • the present invention may be employed in a variety of audio signal processing systems and can help to reduce damage to speaker components that could occur in higher distortion environments. Furthermore, a maximum gain is possible without compression or changing of the desired overall system gain.
  • the gain at the first amplifier is reduced by a defined number of dB while simultaneously increasing the trim by a corresponding number of dB at the second amplifier.
EP20110153360 2011-02-04 2011-02-04 Console de mélange audio évitant une surcharge du niveau sonore Active EP2485395B1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP20110153360 EP2485395B1 (fr) 2011-02-04 2011-02-04 Console de mélange audio évitant une surcharge du niveau sonore
JP2012012746A JP5848141B2 (ja) 2011-02-04 2012-01-25 信号レベルのオーバーロードを避けるオーディオミキシングコンソール
US13/364,761 US9008334B2 (en) 2011-02-04 2012-02-02 Audio mixing console
CN201210024792.7A CN102629853B (zh) 2011-02-04 2012-02-06 避免信号电平过载的音频混频控制台

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP20110153360 EP2485395B1 (fr) 2011-02-04 2011-02-04 Console de mélange audio évitant une surcharge du niveau sonore

Publications (2)

Publication Number Publication Date
EP2485395A1 true EP2485395A1 (fr) 2012-08-08
EP2485395B1 EP2485395B1 (fr) 2013-05-01

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EP20110153360 Active EP2485395B1 (fr) 2011-02-04 2011-02-04 Console de mélange audio évitant une surcharge du niveau sonore

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US (1) US9008334B2 (fr)
EP (1) EP2485395B1 (fr)
JP (1) JP5848141B2 (fr)
CN (1) CN102629853B (fr)

Cited By (5)

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WO2014023363A1 (fr) * 2012-08-10 2014-02-13 Epcos Ag Microphone à système microélectromécanique (mems) et procédé de fonctionnement du microphone mems
EP2887552A1 (fr) * 2013-12-16 2015-06-24 Huawei Technologies Co., Ltd. Circuit de protection pour un convertisseur analogique-numérique utilisé dans une source d'alimentation numérique et procédé de protection de circuit
EP3232572A1 (fr) * 2016-04-06 2017-10-18 Biosense Webster (Israel), Ltd. Système de thermocouple non étalonné
US9876506B2 (en) 2014-06-26 2018-01-23 Nec Corporation Measuring device, measuring system, measuring method, and computer readable recording medium
WO2021252987A1 (fr) * 2020-06-12 2021-12-16 Bose Corporation Commande de gain d'amplificateur de signal audio

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US9300267B2 (en) * 2013-03-15 2016-03-29 Reginald Webb Digital gain control device and method for controlling an analog amplifier with a digital processor to prevent clipping
US9240754B2 (en) 2013-12-30 2016-01-19 Qualcomm Technologies International, Ltd. Frequency fine tuning
US9442141B2 (en) * 2014-01-08 2016-09-13 Qualcomm Technologies International, Ltd. Analogue-to-digital converter
US9391563B2 (en) 2013-12-30 2016-07-12 Qualcomm Technologies International, Ltd. Current controlled transconducting inverting amplifiers
CN108028629B (zh) * 2015-07-27 2021-07-09 Tdk株式会社 用于麦克风的电子电路和麦克风
JP6083457B1 (ja) * 2015-08-18 2017-02-22 オンキヨー株式会社 音楽再生装置
US9755598B2 (en) * 2015-12-18 2017-09-05 Ibiquity Digital Corporation Method and apparatus for level control in blending an audio signal in an in-band on-channel radio system
DE102016221692B3 (de) 2016-11-04 2017-12-07 Sivantos Pte. Ltd. Verfahren zum Betrieb eines Hörgeräts
US9998131B1 (en) * 2016-12-14 2018-06-12 Taiwan Semiconductor Manufacturing Co., Ltd. Hybrid analog-to-digital converter
JP6901362B2 (ja) * 2017-09-26 2021-07-14 株式会社河合楽器製作所 音量制御装置及び制御方法
JP7089183B2 (ja) * 2018-11-30 2022-06-22 アイコム株式会社 信号処理装置および無線機
JP7218637B2 (ja) 2019-03-20 2023-02-07 ヤマハ株式会社 Ａ／ｄ変換デバイスおよびａ／ｄ変換方法
CN113812170A (zh) * 2019-04-01 2021-12-17 伯斯有限公司 动态余量管理

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Publication number Priority date Publication date Assignee Title
WO2014023363A1 (fr) * 2012-08-10 2014-02-13 Epcos Ag Microphone à système microélectromécanique (mems) et procédé de fonctionnement du microphone mems
JP2015530024A (ja) * 2012-08-10 2015-10-08 エプコス アクチエンゲゼルシャフトＥｐｃｏｓ Ａｇ Ｍｅｍｓマイクロフォンおよびｍｅｍｓマイクロフォンの駆動方法
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EP2887552A1 (fr) * 2013-12-16 2015-06-24 Huawei Technologies Co., Ltd. Circuit de protection pour un convertisseur analogique-numérique utilisé dans une source d'alimentation numérique et procédé de protection de circuit
US9876506B2 (en) 2014-06-26 2018-01-23 Nec Corporation Measuring device, measuring system, measuring method, and computer readable recording medium
EP3232572A1 (fr) * 2016-04-06 2017-10-18 Biosense Webster (Israel), Ltd. Système de thermocouple non étalonné
US10098684B2 (en) 2016-04-06 2018-10-16 Biosense Webster (Israel) Ltd. Uncalibrated thermocouple system
US10390870B2 (en) 2016-04-06 2019-08-27 Biosense Webster (Israel) Ltd. Uncalibrated thermocouple system
US10993758B2 (en) 2016-04-06 2021-05-04 Biosense Webster (Israel) Ltd. Uncalibrated thermocouple system
WO2021252987A1 (fr) * 2020-06-12 2021-12-16 Bose Corporation Commande de gain d'amplificateur de signal audio
US11533033B2 (en) 2020-06-12 2022-12-20 Bose Corporation Audio signal amplifier gain control

Also Published As

Publication number Publication date
CN102629853A (zh) 2012-08-08
JP2012165376A (ja) 2012-08-30
EP2485395B1 (fr) 2013-05-01
CN102629853B (zh) 2016-09-28
US20120201400A1 (en) 2012-08-09
JP5848141B2 (ja) 2016-01-27
US9008334B2 (en) 2015-04-14

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